std :: thread，在線程中發生異常導致Visual C++中止錯誤

Question

我一直在試用std：thread。我爲標準算術運算使用二進制表達式樹。我正在創建一個線程來執行計算，並希望檢查除以零。當線程啓動std::async時，異常從工作線程拋出並在主線程中捕獲得很好。當我用std :: thread啓動線程時，拋出異常時，出現運行時錯誤abort()。任何見解爲什麼它與std::async but not std :: thread`？

// Declaration in the Expression.h file 
public: 
    static long double __stdcall ThreadStaticEntryPoint(void * pThis); 


long double __stdcall Expression::ThreadStaticEntryPoint(void * pThis) 
{ 
    long double calc; 

    Expression* pthrdThis = (Expression*)pThis; 
    calc = pthrdThis->Calculate(); 

    return calc; 
} 

case 6: 
    try { 
    // Below works when encountering divide by zero. 
    // The thrown exception is caught correctly 
    // Launch thread using the this pointer 

     std::future<long double> fu = std::async(std::launch::async, 
      ThreadStaticEntryPoint, this); 
     calc = fu.get(); 

     // When Creating a thread as below and I throw a divide by zero 
    // exception I get an error in visual C++. Below does not work: 

     //std::thread t1(&Expresson::Calculate, this); 
     //t1.join(); 

     // Below works fine also 
     //calc = Calculate(); 
    } 
    catch (runtime_error &r) 
    { 
      ShowMessage("LoadMenu() Caught exception calling Calculate()"); 
      ShowMessage(r.what()); 
    } 
    catch (...) { 
      ShowMessage("Exception caught"); 
     } 

long double Expresson::Calculate() 
{ 
    Expression *e; 
    long double calc = 0; 

    e = rep->GetExpression(); 
    if (e == NULL) 
    { 
     ShowMessage("Main Expression " + to_string(rep->GetMainExpIndex()) + " is NULL. "); 
     return 0; 
    } 

    calc = e->Calculate() 

    return calc; 
} 

//************************************************************ 
// Calculate - Calculates Lval/Rval, returns result 
//************************************************************ 
long double Divide::Calculate() 
{ 
    Expression* lop = this->getLOperand(); 
    Expression* rop = this->getROperand(); 
    long double Lval = 0, Rval = 0; 
    long double result = 0; 

    if (lop == NULL || rop == NULL) 
     return result; 

    Lval = lop->Calculate(); 
    Rval = rop->Calculate(); 
    //result = divides<long double>()(Lval, Rval); 
    // The throw error below causes the error 
    if (Rval == 0) 
     throw runtime_error("DivExp::Calculate() - Divide by zero exception occured. Rval = 0"); 

    result = Lval/Rval; 

    return result; 

} 

Answer 1

即是預期的行爲：

參見std::thread documentation

線程立即開始基於結構相關聯的線程對象的執行（待定任何OS調度延遲），開始於頂作爲構造函數參數提供的高級函數。頂級函數的返回值被忽略，如果它通過拋出異常終止，則std :: terminate被稱爲。

見std::async documentation

然後異步執行上一個新的執行線程函數f（含初始化所有線程當地人），就好像通過催生的std ::線（F，ARGS ... ），，只是如果函數f返回值或引發異常，它將存儲在可通過異步返回給調用者的std :: future訪問的共享狀態中。